Centrifugal machine.



No. 848,037. PATBNTBD MAR. .26, 1907. B. LJUNGSTRM. GBNTRIPUGAL MACHINE.

APPLICATION FILED SEPT. 22, 1905.

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Arm/Mw h UNITED STATES lILAITENT OFEIOE.

BIRGER LJUNGSTROM, or STOCKHOLM, SWEDEN, ASSIGNOR TO AKTIE- BOLAGET SEPARATOR, OF STOCKHOLM, SWEDEN, A COMPANY.-

CEN'TRIFUGAL MACHINE.

Speccation of Letters Patent.

Patented March 26, 1907.

Application filed September 22, 1905. Serial No. 279,650.

Be it known that I, BIRGER LJUNGSTRM,

a subject of the King of Sweden, residing at Stockholm, Sweden, have invented a new and useful Improvement in Scrapers for Centrifugal \Machincs for Separating Solid Matter from Liquids, oi' which the following is a full, clear, and exact description, reference being had tothe accompanying drawings, which form a part of' this specification.

My invention relates to centrifugal Inachines for separating solids from liquids, and particularly to such machines wherein the solids are transported transversely through the layer of liquid from the periphery of the bowl to its center, whence .they escapeby means of scraperwheels located within the bowl. Such a machine as set forth inthe United. States Patent lto4 Ericsson, No. 773,489, of October 25, 1904.

It has been proved that centrifugal machines of this kind work in a very unsatisfactory manner when very finely pulverized materialsmas, for instance, lime, kaolin, and whiteningare separated.

its object to rovide Scrapers of such shape as to enable tliem to catch even solids of this kind and transport them from the periphery of the bowl to its center.

In the drawings, Figure 1 is a vertical section, and Fig. 2 an inverted plan, of a scraping device embodying my invention. Fig. 3 is a verticalsection, and Fig. 4a plan, of a modification. e

In Figs. 1 and 2,'a is the hub, from which brackets b project radially. To these brackets b scoo s c c cZ c3 are secured. Said scoops are cup-s aped, closed at the top and bottom and open only in the direction oi rotation, so that they form a sort of receptacle wherein the solids are caught.

I Figs. 3 and 4 the cup-shaped scoops c'ci This drawbackis avoided by this invention, which has for.

l adapted to are lnot provided with top and bottom walls, but are located between two rings or annular disks d d, secured to spokes e, projecting radially from the hub f The disks d are show. iiat and extending horizontally and parallel with each other, although I do not confine myself to this arrangement. The disks d inclose the scoops c4 c4 at the top and bottom,

thus forming receptacles O'penmg only in the direction of rotation, like the receptacles of Figs. 1 and 2. The essential characteristic of these scoops is that they are cup-shaped and formed and arranged in such a manner that with regard to a plane through the axis of rotation and the radius 1", Figs. 2 and '4,

they have their bottoms situated deeper than the edges. Shaped thus eachv scoop will form a rece tacle capable of catching very small partie es.

For the purpose ol indicating some of the possible variations in the form of the scoops I have shown all of the four scoops in Fig. 2 as of different s eciiic shape.

Havin now lly described my invention, what I c aim, and desire to protect by Letters Patent, is-

A scraping device for centrifugal machines for separating solid matter from liquids cornprising scoo s and a rotary sup ort therefor liie inserted within t e bowl, said scoops being held in permanent relation to the rotary support in such osition that relatively to a plane through t e radius and the axis of rotation of the support their'bottoms are situated respectively deeper than their edges.

In testimony of which invention I have hereunto set my hand, at Stockholm, Sweden, on this 6th day of Se tember, 1905.

BIRG R LJU N GSTROM.

l/Vitnesses z CARL FRIBERG, HARRY FR. ALBIIIN. 

